#include<stdio.h>

int main()
{
 	int year,leap;
 	printf("enter year:");
 	scanf("%d",&year);
 	if(year%4==0)
 	{
 		if(year%100==0)
 		{
 			if(year%400==0) leap=1;
 			else leap=0;
		}
		else leap=1;
	}
	else leap=0;
	if(leap) printf("%d is ",year);
	else printf("%d is not ",year);
	printf("a leap year.\n");
 	return 0;
}

